Two-pin electric plug, to be wired without unsheathing the lead

ABSTRACT

An unearthed two-pin electric plug is provided. To avoid the need for tools when wiring, the plug includes a blade (2,22,62) rotating about the axis of a hinge (1) which is parallel or perpendicular to the axis of the electric lead. In the two fullest embodiment of the plug, projections cooperate to split, set up connections and connect up the lead. In one embodiment, the inner surface of the lower plug portion includes a base (80) with grooves (71,72,73) engaged by tapered splitting portions (51,52,53) which push the two conductors of the leads sideways so that they slide over the base (80) and are caught on contact spikes (5) at almost the same time as said lead is cut by the central blade (62). The lead is held in position by a filler bar (50) and by the splitting portions (51,53) which drive the lead sideways so that it winds through recesses (81,83).

The invention relates to two-pin electric plugs, to be used with aflexible two-wire cable.

The aim of this invention is to dispense with the need of any tools,such as knives, screwdrivers or pliers, necessary to fasten the cable tothe plug, as well as to facilitate this operation to a greater extentthan in the prior related inventions.

Prior inventions have not succeeded in dispensing with the need of anytool for the wiring.

It is the case of the Switz Patent 383 458, and the U.S. Pat. Nos.2,658,184 and 4,842,542, called D1, D2 and D3, respectively, hereafter.

In D1, a built-in screw, has to be screwed in, either with screwdriver,or with a coin used as one.

In D1, D2 and D3, the device calls for the use of plier to even out theends of the electric cable, if needs be.

In D2 and D3, there is no splitting device for the cable wires,therefore a cutting tool is required, as current two-wire cables arecoated with an outer sheath.

In D1 the separation process of the two cable wires, which uses acone-shaped screw, calls for strength when both wires are coated by theouter sheath. This cone-shaped screw system does not allow either thewires to follow a sinuous enough path, that would lock them into placein the event of strain applied on the plug (see D1, FIGS. 2 and 5).Furthermore, the curved path resulting from the separation of the wiresis the actual connection spot. Therefore, any strain applied on thecable, is also directly applied on the connection devices and there is areal possibility of damaging them. This becomes even more apparent if weconsider that most wires--those used in our invention too--exhibit sharpand fragile metallic prongs at their ends. In D2, the ridge system (33)used to lock the cable (FIGS. 1,4,5) does not seem to be very efficient.

The present invention solves these problems.

In the three embodiments of the invention discussed here, the cuttingand the wiring of the electric cable are performed simultaneously withthe shutting of the plug.

Furthermore, in the second embodiment of the invention, the cable is setinto position automatically. Finally, in the third and fullestembodiment, the shutting of the plug causes the wiring and, at the sametime, twists and turns in the path of the cable, such that, even astrong stress applied on the cable, has no effect on the part of thewires used in the connection. Also, no strain is brought on the plugcontact parts.

The three embodiments of the invention share the following:

At least three contact spikes are used, with a 5 mm spacing lengthwise,and laterally so that the inner conducting part of each wire may bereached to at least a third of its depth on both sides, and to thecenter of its section in the middle. The spikes should be orientedtoward the conducting heart of the wire, according to the direction itfollows as it gets cut, and should be long enough to cut through theconducting part of the said wire. The said contact spikes are at leastthree tenths of a millimeter thick, or for example, a third of thediameter of the conducting portion of the cord; these spikes being abuilt-in feature of the female or male pins of the plug. The points andedges of these elements are sharp or should be sharpened.

Their use dispenses with the need of stripping the insulating sheathfrom the ends of the cord and screwing in the unsheathed wires.

A T-shaped blade is incorporated to the plug, and securely hooked in theplastic block, in which is is partially embedded. The dimensions of thisblade are such that, in the fullest embodiment of the invention, thecable is fully cut to its end situated in the plug, prior to its wiresbeing led through their recesses.

This feature dispenses with the need a knife to unsheathe the electricalcord, and split the two wires.

The cutting device, built into the plug, calls for the presence of ablade rotating around an axis, this axis being either parallel, or, onthe contrary, perpendicular, to the longitudinal axis of the cable.

In the first embodiment of this invention, the rotation axis is parallelto the axis of the cable, and in the other two, the rotation axis isperpendicular to the axis of the cable.

In the first embodiment of the invention, the male and the female pinsare cut lengthwise, along the plane containing the diameter of each ofthe two male pins or, of each of the two female pins, according to thekind of plug. This plane will be called "longitudinal median plane ofthe pins" or "longitudinal median plane", throughout this patent. In thecase of the male pins, the inner part of the pins located into theplastic block is shaped to act as a contact site for the wires. Theinner diameter of these half-cylindrical parts is slightly longer thanthe outer diameter of a wire from the largest cable fitting the plug.

In the case of a female pin, the inner diameter of the inner part isequal to the outer diameter of the male pin. The contact site is thenformed by a half-cylinder of the same shape and size as those of themale pin. In both cases, the lower half of the contact site is equippedwith a heightening, that decreases by a quarter the total height of thecontact site, in order to squeeze the cable wire and hold it into place.Both the top and the receiving portions of the (male or female) plugalso include a contact device in-between, in the form of other (male andfemale) pins in the plug itself. This contact device has a vase-shapedtransverse profile, larger at the top than at the bottom, round at thetop, and split into two halves. This mechanism acts as a pressurelocking device for the whole plug. The contact spikes stand on thebottom of the receiving (lower) half of the contact site.

In the case of the embodiment where the hinge is perpendicular to theaxis of the cable, the male and the female pins include contact spikeson their outer surface. The spikes and the pins then form one singleblock (just as in the previous example). In order for the connection tobe a one-step operation in the first example, it is necessary that thecable be fully cut, before both its wires are driven by a block called"pressing block", sliding along a 40° sliding plane. Both sliding planesform a splitting projection, whose profile is complementary to that ofthe pressing block. The cord is then led to the contact site, at thebottom of which the contact spikes stand, oriented in the same directionas the sliding planes and the axis going through the center of the (maleand female) pins and the wires, once they are at the bottom of thecontact site. The pressing block contains edges that scrape the slidingplanes, and form the inner edge of the higher surface of the leadinggrooves and the contact site. The total height of the cavity formed bythe contact site and the higher leading groove is smaller by a quarterof a radius than the diameter of the largest cable wires fitting theplug.

In order for the cutting to follow the complete path of the wires, it isnecessary that the knife blade have the following characteristics:

the angle of its front end (δ) is (90°-α)

the height (h) at the front end is at least equal to h=l₁×tg(α)+D/sin(δ)+AD+E/2, where l₁ the length of the wire lying in thecontact site, α the angle at which the wire goes down, D the diameter ofthe largest cable wire fitting the plug, AD the plunging distance of thewire, and E the thickness of the higher portion.

the length of the cutting edge is at least equal to l₁ +the length ofthe portion of wire that goes down, and whose value is describedelsewhere.

According to the second, and most recent, example with perpendicularaxes, the wiring is also performed in a one-step operation and can takeplace during the cutting of the cable. The inner surface of the activeplug portion contains, as previously, projections cooperating with thoseof the inner surface of the passive portion, to split, set into place,and connect the cable to the plug.

The inner surface of the active portion contains a filler bar (50),i.e.a holding device keeping the wires separated by the blade (62) and splitby the three splitting portions (51,52,53), that enter their respectiverecesses (71,72,73), located on the inner surface of the passive plugportion. The passive portion contains a sliding surface parallel to thelongitudinal median plane of the pins, called the base (80), for thecable wires. The sliding occurs while the splitting devices come intotheir grooves, splitting and connecting the wires. The action of theconical splitting portions (51,52,53) that start the connection furtherachieved by piercing the insulator, is facilitated, and completed by thefiller bar (50), which ensures a maximum penetration of the contactneedles (4) or spikes (5) into the conducting heart of a cable wire. Thefiller bar (50), combined with the splitting portions, also ensures thatthe cable wires are tight and fixed, as long as the plug remains shut.The front (51) and back (53) splitting portions have a maximum widthgreater than that of the filler gap (50), while the walls (85) of thecase include recesses, through which the wire can wind. This deviceholds the cord in position, and avoids any displacement duringaccidental strain on the cable, or during use, as well as any damage tothe contact spikes (5) or accidental disconnection of the system.

The advantages and features of the invention are illustrated in theaccompanying drawings.

FIG. 1 is a perspective view of the inside of a male plug in the examplewhere the rotation axis of the hinge is parallel to the axis of thecable.

FIG. 2 is a similar view, for a female plug.

FIG. 3 is a view down the longitudinal axis of a female pin, showing thearrangement of the contact spikes on the lower portion of the block.

FIG. 4 is a perspective view through the plug, with the hinge axisperpendicular to the longitudinal axis of the cord, without the pressingblock, the back portion and the back hood.

FIG. 5 is a down view through the plug, without the pressing block.

FIG. 6 is a down view through the pressing block, without the knifeblade.

FIG. 7 is a side view through a female plug, with the pressing blockopen at an angle equal to that of the slope of the leading grooves.

FIG. 8 is a perspective scheme showing the relationships between theangles and the dimensions of the various elements in the plug, for thefirst example with perpendicular axes.

FIG. 9 shows three successive sectional views, 9a, 9b, 9c, of the plugshown FIG. 7 but, as if the pressing block was shut.

FIG. 10 is a perspective view, with the active portion being removed,and truncated on front, for an example of the plug according to thethird version of the invention.

FIG. 11 is a longitudinal sectional and central view of the sameexample.

FIG. 12 is a scheme explaining how to calculate the minimum width of thegrooves for the splitting portions.

FIG. 13 is an elevated view of the inner surface of the lower portion ofthe example according to the third embodiment.

FIG. 14 is an elevated view of the inner surface of the upside-downhigher portion of the same example (third embodiment).

FIG. 15 is a sectional view of the previous example (FIG. 14).

FIG. 16a is a side view of a male pin of the plug, according to theembodiment with the perpendicular axes.

FIG. 16b is a front view of a male pin of the plug, according to theembodiment with the perpendicular axes.

FIG. 17 is the scheme of a front view of a pin/cord couple, showing theorientation of the contact spikes, according to the first embodiment,with perpendicular axes.

FIG. 18 shows the shape and arrangement of the contact spikes.

None of these figures is drawn to scale, but FIGS. 3,5,7,9,11,13,14 canserve as references. However, some details are approximated, and theprecision of the drawings is not perfect. Although the proportions areindications, they constitute nevertheless a rather precise picture ofthe reality. For clarity in the drawings, a lot of angles have beendrawn as sharp. It is only necessary for the the wedging edge and bothedges of the scraper, as well as for the hollow projections of the lowerportion in the three embodiments. All other angles may be rounded.

DETAILED PRESENTATION OF THREE EMBODIMENTS OF THE INVENTION

The most conventional embodiment includes a two-part plug: an outercase, in which the pin-containing block is embedded. In this version ofthe embodiment, the axes of the hinge and of the electrical cord areparallel. The following description relates only to the block.

FIGS. 1, 2 and 3 will be discussed here. FIG. 1 shows an example of amale plug, in which the block is split into two halves, an active (11)and a passive (12) one, jointed around a hinge (1). In the center of theactive portion (11), there is the blade (2), used to cut the cablelengthwise and set the two wires apart, after having evened out theends, with the same blade (2). This can be performed by closing down theactive portion (11) onto the passive portion (12), on the cable, placedperpendicularly to the longitudinal axis of the knife cavity (3). Thepins (13) are divided into two halves, full outside the block (11 or12), whereas their portion inside the block (7) is hollow. The pins(13+7) form one piece, with a contact cavity (8) in the lower part ofthe block (12), and contact pins (9) in the higher portion (11). Thepins (9) and the cavity (8) are complementary in shapes, the pins (9)being the male pins of a "plug inside the plug", so that the samecurrent goes through the two outer halves of the pins (13). Thetransverse profile of the pins (9) shows a relative narrowing at thebottom and a widening near the top, curving around toward the centralslot (10). Because of this profile, parts (8) and (9) are locking theentire block in a closed position. The system works as follows:

The cable is laid down in the knife cavity (3), and centered so that theblade is placed over the portion of the cord to be cut, and between thetwo wires, and then cut lengthwise by closing the system and applyingpressure. The active half (11) of the plug is then lifted and each wireis placed into each inner part of the pins (13). One needs only toslowly but firmly close the active part (11) down onto the passive part(12) of the plug.

FIGS. 1 and 2 show the contact needles (5) or spikes (4) drawn on theactive portion (11) of the block, but they can also be placed on thepassive portion (12). In that case, the user will have to set the wiresapart and place them on the contact spikes or needles--by hand--so thatthey penetrate the insulating part of the cable. Closing the system willhave the spikes cut through and reach the heart of the cable. We havedrawn two kinds of contact shapes. Both shapes can be used but it wouldnot be sensible to place needles in one cavity and spikes in another.

FIG. 3 shows a blown-up transverse view of the metallic piece used asthe integrated part of the female pin (7) and the half-cylinder (16). Italso shows the arrangement of the contact needles or spikes (4 or 5),and their length that should be slightly longer than the thickness ofthe insulating sheath (101) plus the diameter of the conducting heart(102), for the thickest cable that can fit the plug. The contact spikesare arranged in a staggered fashion, spaced by a distance equal to theirown thickness "e", that is a third of the diameter of the conductingheart (102), with a minimum of three tenths of a millimeter, andarranged in such a way that one of them is situated on the longitudinalvertical and central plane of the wire, and the others distributed onthe right and the left sides of the cable. It is worth mentioning theflat piece (17) used to prevent the cable from getting loose in thehalf-cylinder (16), also called contact site.

FIG. 2 shows a female plug, where the arrangement of the elements isdifferent, because the integrated portion (7) of the pins (13) makes upthe entire plug itself and is occupied by the male pin ready to beconnected. The contact site (8) and the inner pin (9) are pushed backbehind the female pins, thus lengthening the block formed by parts (11)and (12). The half-cylinders (16) will accommodate the wires in the sameway the inner parts (7) of the male pins (13) do for the male plugs.Small fixing lugs (14) are also necessary in the plastic block.

The outer surfaces of parts (11) and (12) are carved in such a way that,as in the existing devices, the closed system can be fitted in a case.

According to the first version of the invention, four other operationsare needed to perform the connection, after the ends of the cable havebeen evened out:

1) longitudinal cutting of the cable

2) setting up of the cable wires in their grooves

3) closing of the block onto itself

4) fitting of the block into a case

These four steps are combined into one single operation in the secondembodiment of the invention.

The parting of the cable wires is also performed with a blade, but rightafter the cutting, by pushing down a pressing block. They areautomatically set into place with the pressing block scraper, theleading grooves and the sliding planes. There is no need to fit theblock into a case, since the system forms a whole block in itself.

FIG. 4 represents the passive portion of the plug, and the arrows showswhat happens. The cable is inserted in the plug from behind, placed inthe leading grooves (21), and set into place on the wedging edge (20),all the way to the other end of the plug, where it is inserted in thestabilizing tip (40) (see FIGS. 5 and 7), not shown on FIG. 4. The cableis then cut by the blade (22) (see FIG. 7), split into two wires, thatslide along sliding planes (23), down to the bottom of the contact site(24) (see FIG. 5), where they are led by each lower edge (25) of thescraper (35) (see FIGS. 6 and 7) and caught on the contact needles orspikes (4 or 5), which are built-in features of the plug male or femalepins (13). The hinge (1) is represented by a doted line (FIG. 4). Thereceiving slot for the blade (26), and the closing device (27) are alsoshown. The descending part (28) of the leading grooves goes off thecentral longitudinal axis, to reach the contact site (24) (see FIG. 5also). It is also worth mentioning the presence of the back hood (30),not shown on FIG. 4. FIG. 5 shows all the elements presented in FIG. 4,from an elevated point of view, which is more representative of theactual plug dimensions.

FIG. 6 shows the hinge (1), the scraper (35), the top portion of theleading grooves and the lower edges (25) of the scraper (that can alsobe considered as the starting point of the top portion (33) of thegrooves). The flat part coming into contact with the closing device iscalled the closing hammer (37). Near the hinge, the front hood (34)lower surface is heightened by a raising portion (36), used to give wayto the cable (not shown here). The blade is not shown either, but can beseen on FIG. 9 (a,b).

FIG. 7 is a side view and also a complete view through the device. Thecable (103) follows a two-turn path, which split it into two wires. Wecan also see the hinge (1) and the closing portion (27), as well as theclosing hammer (37), that come in contact one with another in the closedposition (see FIG. 9 a,b also). It is also worth mentioning the openingspot in the receiving slot (31) for the blade (see FIGS. 4 and 5 also).Only one higher edge (38) of this slot is represented here. The higheredge (32) of the scraper (35) is represented as a dotted line. Theposition of the pressing block is such that one can see that the wire(103)-containing cable has been cut prior to its being brought down bythe top portion (33) of the leading grooves and by the scraper's edge(38). These two parts are still in a horizontal position and above thecord as the blade (22) is already under the edge (38) of the receivingslot, that the cord cannot access. The angle of the hood (34), hence thepressing block itself, is equal to α, which is the vertical angle atwhich the cord goes down to the contact site.

The back insertion of the cable can be seen (43) (see also FIG. 9c).This insertion hole is slightly smaller than the thickness of thesmallest cable that can fit the plug, so that the cable has to be"forced into" on a small distance "d" but is free thereafter. Thewedging edge (20) is rounded in (44), as well as the back hood (30) in(45) and the leading grooves (21) in (46). The hidden parts of the blade(22) are drawn in a dotted fashion. The cutting edge and the verticalpart of the blade form an angle δ equal to (90°-α), in the front end. Inthe back end, the blade is shaped into a circular arc, with r=E/sin(ρ)(where E is the thickness of the back hood (30) and ρ, the angle betweenthe wall (47) of the hinge (1) and the inner surface (48) of the backhood (30)). The radius r should be increased by one or two millimetersas in FIG. 7. The height of the blade (22) is equal to:

    h=l.sub.1 ×tg(α)+D/sin (δ)+AD+E/2

(see p.3, lines 15-20). Finally, in order to know the length of thecutting edge, we must look at FIG. 8, which explains the relationshipsbetween the different angles and distances.

AD=B"B' and B'B=B"B'/tg(β) therefore B'B=AD/tg(β)

Moreover: B"B'=B'B/cos(β)

And: AB"=B"B'/tg(α) therefore AB"=AD/tg(α)

B"B/AB"=tg(γ) gives us γ and AB, since AB"/cos(γ)=AB

Furthermore: AB+BC=1 and OA+AB"+B'C'=L and

B'C'=AB+BC-AB"

If we assume that OABC is a broken line going through the center of awire, we can notice that (AB+BC =1) is the length of the wire to be cut,and therefore, the minimum length of the blade cutting edge.

About the other dimensions of the plug:

If β is chosen so that the wire can slide easily on the sliding plane(23), that is, β≧40°, and BB' is determined by the standard spacing ofthe pins in an electric plug, AD is easily obtained, and hence the slopefollowed by the wire. Finally, BC should be long enough to accommodateat least three contact spikes with a 5 mm spacing lengthwise--i.e. BC≧10mm--and 0A should be chosen according to the total length of the plug.AB" is then easily calculated, as well as α, γ, finally AB, which allowsfor the calculation of the length of the cutting edge of the blade. Theplug can then be built up.

Successive sectional views of the plug will help in getting morespecific details (FIG. 9).

FIG. 9(a) represents a male pin, and a female pin is shown on the left(13). If we want to use the same value for β in both cases, we need tovary the distance between the contact sites (24) and the pins (13). Themale pin will then sit further away from the contact site than thefemale pin, and the difference will amount to the difference between theradii of the female and male pins. Drawings (a) and (b) show that theleading grooves (33) have a profile that slightly squeezes the wire(103). The T-shaped profile of the blade (22) facilitates its anchoragein the plastic material. The higher edge (32) of the scraper and theedges (25) of the scraper, used to drive the wires (103) to theircontact site (24), are particularly worth-mentioning here. The two otherdrawings do not need any comment.

Let us now turn to FIG. 10, and describe the constituting elements ofthe plug, for the third embodiment of the invention:

Hinge (1), back portion of the hood (30), closing hammer (37), frontportion of the hood (34), knife blade (62), male or female pins (13),filler bar (50), splitting corners or portions (front (51), central (52)and back (53)), cone-shaped back portion (54) of the filler bar,receiving slots for the splitting parts (front slot (71), central slot(72) and back slot (73)), side grooves (front (81) and back (83)), frontand back slots, receiving slot for the blade (26), closing portion (27).

FIG. 11 shows the contact spikes (5), as well as the back insertion hole(43) for the cord. The hole outline (45) is round and includes apinching device for the cord, a bump (49) here.

The front portion of the blade (62) is longer than the hood (34), inorder to fully cut the cord in its front end, but this is not necessary.When set into place, the cord meets the stabilizing tip (40), theoutline of which is reamed and rounded so that the cord can be smoothlyinserted. The hood is rather thick, therefore its back portion (39) canbe tapered, to get a thinner part, before the actual thinning down thatallows for the hinge (1). FIG. 12 shows the relationships between thedifferent dimensions of the plug: one notices the contact spikes (5),which are arranged halfway through the cord thickness; the splittingportions (51,52,53) and their respective sites (71,72,73); the sidegrooves (81,83) corresponding to the extreme sites (71,73) and, ofcourse, it should be noted that the depth of a receiver for a splittingportion cannot be smaller than H, which is the excess height of thefiller bar (50) lower level.

Let us assume a splitting portion of thickness E, located at a distanceL from an axis O (representing the hinge (1)). The axis O is situated ata distance P from a plane X-X' and has to penetrate this plane by adepth H. The width of the receiver for the splitting portion must be atleast equal to P/tg(ω)-L, where ω is the angle (XX')SO, where S is thefurthest extremity from the axis O, and the SO line, the distancebetween the base of the splitting portion and the axis. The angle ω isthen calculated as follows:

    P/SO=P/[(P+H).sup.2 +(E'+L).sup.2 ].sup.1/2 =sin (ω).

The values for L, H, and P depend on the dimensions of the plug. Thethickness E' should be as small as possible, but big enough for thesplitting portion to remain rigid during the plug closing operation. Forclarity in the drawings, E has been overestimated, and the otherdimensions do not respect the actual proportions.

FIG. 13 displays the receiving slot of the blade (26), and partlyshowing through, the pins (13) comprising the contact spikes (4). Thechannel (56), that drives the cable to the stabilizing tip (40), startsright after the insertion hole (43). The specific width of this channelis the average of all conventional cable diameters, so that the thinnestcable will be slightly loose and the thickest will be slightly squeezed,but without any damage, due to the elasticity of the sheathe. Once theplug is shut, the cable follows the path marked with arrows, windingthrough the side grooves (81,82), and constantly remaining under thepressure of the splitting portions, acting as tighteners.

FIG. 14 shows the triangular back part of the filler bar (50), whoselower edges are chamfered, and the blade (62) whose back and front endsare slightly longer than the bar. This feature allows for the completecutting of the cable in front, and for the a cut remote enough from theback end of the bar, so that the latter can easily penetrate as the pluggets shut. FIG. 15 is a front view of a front splitting portion (51).The more pointed its projection cone (55) is, the easier the closing ofthe plug. However, the height, H, is limited by that of the plug case.It requires θ≧45°. The section of the splitting portion should also berounded. The splitting portions also act as blade tighteners.

The last embodiment of the invention is considered the best. The novelfeature is the filling of the inter-wire space during the splitting by avolume that belongs to the blade-containing part (the active plugportion here). Such volumes or projections have not been described inthe three embodiments of the invention--and will not be--as they do notmodify any fundamental aspect of the invention. However a flat part mustbe designed on the outer surface of the passive plug portion, so thatthe plug remains stable as the final closing of the system is performed.

FIG. 16a, 16b, 17, 18 relate to the contact needles or spikes for thelast two versions of the invention. These have the same characteristicsas for the first version and the figures only describe theirarrangement. FIG. 16a is a side view and FIG. 16b is a front view of thearrangement for a male plug (the angle β only relates to the secondversion).

FIG. 17 is a front view of the penetration of the cable through itssheath (101) and its heart (102). The spike (4 or 5) length is greaterthan for the other example of the invention, because the space betweenthe cable (104) and the pin (13) must be taken into account. It issimilar for the third example.

FIG. 18 shows the shape of the contact spikes, the point (60) and edges(61) of which must be sharp to ensure a thorough penetration.

In order to have suitable hinges, the three embodiments of the inventionrequire at least three metallic pieces partly embedded into aninsulating plastic material, such as polypropylene. The moulding of theplastic pieces is a one-step operation.

I claim:
 1. Flat cable two-pin electric plug composed of two parts,onepassive (12), the other active (11) connected by a hinge (1), said plughaving needles (5) or contact spikes (4) designated to cross theconductive heart (102) of each wire (104) of the cable (103), comprisinga cutting blade (2,22 or 62) which cutting edge is parallel to thelongitudinal axis of the cable when positioned, said cutting blade beingembedded in one of the said parts of the plug and mainly acts as aseparator of the two wires (104) of the cable (103) at least tenmillimeters lengthwise.
 2. An electric plug as described in the claim 1,with the rotating axis of the hinge (1) joining the active (11) and thepassive portion (12) paralell to the longitudinal axis of the cable(103), comprising male pins (13) diametrally split along thelongitudinal median plane which contains a diameter of each of the pins(13), each of the two halves of each pin comprising a hollow halfcylindrical aera embedded in the active portion (11) corresponding toone of the said halves of the siad pin (13), or embedded in the passiveportion (12) for the other of the said halves of the said male pin (13),the said hollow aera (7) being used as a contact cavity for each wire ofthe cable, the said hollow aera (7) also including laterally a femalepin (8) for one of the halves (11 or 12) of the plug or a male pin (9)for the other half, said pins (8 and 9) designated to fit into eachother, to act both as contact between the two halves of the pins (13)and as a pressure locking of the system.
 3. Electric plug as describedin the claim 1, with the rotating axis of the hinge (1) joining thepassive half (12) and the active one (11) of the plug, parallel to thelongitudinal axis of the cable (103) comprising female pin (7)diametrally split along the longitudinal median plane which contains adiameter of each of the said pins (7), each of the halves of the femalespins (7) including laterally an aera (16) with rear female parts (8) onone of the halves (11 or 12) of the plug and rear male parts (9) on theother half of the plug designated to fit into each other, to both act asgood contact between the two halves of the pins (7) and as a pressurelocking of the system.
 4. Electric plug as described in the claim 1 withthe axis of the hinge perpendicular to the longitudinal axis of theplaced cable (103), comprising in its active part (11), also called thepressing block, beside the blade (22) a two slopes roof-shaped scraper(35) with lower edges (25) fixing the limits of the leading groovesdesignated to drive and to maintain the wires (104) of the cable (103),after the cutting of the said cable in contact with the passive half(12) or more precisely in their contact site (24), after having madethem slide over the sliding planes (23) on which fits the scraper (35),the said passive half (12) also comprises a wedging edge (20) and astabilizing tip (40) for the cable (103) where the said cable laysbefore the cutting operation.
 5. An electrical plug as described inclaim 1, with the axis of its hinge (1) perpendicular to thelongitudinal axis of the placed cable, comprising on the inner surfaceof the active part (11), beside the blade (62), a filler bar (50) whichrear part is triangular shaped, at least three splitting portions(51,52,53) which profile is cone shaped, ending splitting portions(51,53) whose maximum width is grater than that of the filler bar (50),also acts as a locking device of the wires (104) that wind through sidegrooves (81,83) corresponding to the splitting portions (51,53), a frontand rear endings of the blade (62) protruding the front and rear endingsof the filler bar (50); the inner surface of the passive part (12)comprising a base (80) parallel to the longitudinal median plane, thewires (104) of the cable (103) sliding on the said base (80) during theshutting down of the plug, the said wires (104) getting pierced by thecontact spikes (4) arranged laterally,the said inner surface comprisingalso projections called receiving slots (71,72,73) for the splittingportions (51,52,53 respectively), a channel (56) and a stabilizing tip(40) into whose the cable (103) is set before the cutting operation.